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Magnetic paper from sugarcane bagasse fibers modified with cobalt ferrite nanoparticles

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Magnetic paper sheets were prepared from bleached sugarcane bagasse fibers and cobalt ferrite nanoparticles by lumen loading method. Sugarcane bagasse is an important fibrous raw material widely used worldwide for papermaking, whereas cobalt ferrite nanoparticles is an appropriate material for fibers modification given their magnetic properties. Cobalt ferrite nanoparticles were synthetized by coprecipitation method and coated with silica by hydrolysis and condensation of tetraethyl orthosilicate (TEOS) molecules. Then, silica coated magnetic nanoparticles were functionalized with polyethylenimine (PEI), as retention aid, by electrostatic bonding. It was observed that the loading degree of magnetic fibers depends on nanoparticles concentration and PEI dosage, which was determined by thermogravimetric analysis (TGA). Scanning electron microscope (SEM) shows the deposition of coated nanoparticles on the surface and into macropores of fibers. All samples exhibited ferromagnetic behavior. The coercivity values of magnetic fibers are higher than 0.2 kOe. This indicates that these fibers could be used to produce paper for magnetic recording purposes. Magnetic papers with 10 and 20% of modified fibers were manufactured. Brightness and tensile index of papers were decreased with the rise of loading degree. CIEL*a*b analysis shows the color differences between unmodified and modified papers.

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We would like to acknowledge the financial support of this project from Universidad de Cartagena (Grant No. 009-2015) and Universidad Pontificia Bolivariana. Additionally, we are grateful to Prof. Juan Hinestroza from Cornell University and PhD student David Patiño from Universidad de Cartagena for performing TEM measurements, as well as Prof. Sandra Correa of Universidad Pontificia Bolivariana for SEM images.

Author information

All authors conceived and designed the experiments. Oscar Piñeres and Emma Salcedo performed the synthesis and functionalization of nanoparticles, modification of fibers and preparation of magnetic papers samples. Oscar Piñeres wrote the manuscript. All authors revised, discussed and approved the final manuscript.

Correspondence to Oscar H. Piñeres.

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Piñeres, O.H., Salcedo, E.C., Herrera, A.P. et al. Magnetic paper from sugarcane bagasse fibers modified with cobalt ferrite nanoparticles. Cellulose (2020).

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  • Cobalt ferrite nanoparticles
  • Bleached sugarcane bagasse fibers
  • Polyethylenimine
  • Lumen loading
  • Magnetic paper sheets